Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1992S10/T10 P/U 4WD V6-173 2.8LREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINTRANSFER CASECONTROL MODULEDESCRIPTION AND OPERATIONTCCM INPUTS AND OUTPUTSTCCM INPUTS
1992 Chevrolet S10/T10 P/U 4WD V6-173 2.8L
TCCM Inputs
1992 Chevrolet S10/T10 P/U 4WD V6-173 2.8LSECTION TCCM Inputs
4WD Selector Switch Wiring Schematic:
OPERATION
2HI to 4HI selector switch input
When the transfer case is in 2HI and the operator presses the 4HI area of the rocker switch, the 4HI contacts of the selector switch close, connecting circuits 141 and 1564, and furnishing 12-volts to pin C5 of the TCCM connector. The 12-volt signal at pin C5 commands the Transfer Case Control Module (TCCM) to signal the electric-shift motor to shift into 4HI. The contacts return to the open position as soon as the switch is released.
4HI to 2HI Selector Switch Input
If the transfer case is in 4HI and the operator presses the 4HI area of the rocker switch, the 4HI contacts of the selector switch close, connecting circuits 141 and 1564 and furnishing 12-volts to pin C5 of the Transfer Case Control Module (TCCM) connector. The 12-volt signal at pin C5 commands the TCCM to signal the electric-shift motor to shift into 4HI. Again, the contacts return to the open position as soon as the switch is released.
2HI to 4HI to 4LO Selector Switch Input
When the operator presses the 4LO area of the rocker switch while the transfer case is in either 2HI or 4HI, the 4LO contacts of the selector switch close, connecting circuits 141 and 1559, and furnishing 12-volts to pin C3 of the Transfer Case Control Module (TCCM) connector. The 12-volt signal at pin C3 commands the TCCM to signal the electric-shift motor to shift the transfer case into 4LO. Once more, the contacts return to the open position as soon as the switch is released.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.